Grinding machine



Patented May 19,1925.

yUNlTlezn STATES PArrasrr OFFICE.

`ARTHUR A. ARNOLD, on. IIARTFOnn'CONNECTICUT, ASSIGNOR To AMERICAN OPTI- CAL COMPANILOI` SOUTHBRIDGE, MASSACHUSETTS, A VOLUNTARY ASSOCIATION OF MASSACHUSETTS.

Application filed July 8,

To LZZ whom t may oomcem:

Be it known that I,.ARTHUR A. ARNOLD, a citizen of the United States, vresiding at Hartford, 'in the county otHartford and State of Connecticut, have invented cert-ain new and useful Improvements in, Grinding Machines, of vwhich the following is a specification.

This invention relates to improvements in lens grinding machinery and has for i-ts leading object. the provision of al novel and improved construction of such machinery in which the driven spindle maybe operated at'dii'erent rates of speed as desired.

A further object ofy the present invention is theprovision of mechanisrnof this character which vshall be simple of operation and readily mounted and contained within the base of the machine in arsin'iplc and satisfactory manner. y

A further object ofthe invention is the provision of a lens grinding machine which shall vbe automatic in operation, and in which thespeed of such automatic operation may be varied as desired. v 1

A further object ofthe invention fis the provisionof'a novel and leiiicient machine particularly adapted for the automatic pro- 1 duction of torio orcylindrical lenses.

- Otherobjects andadvanta-ges of myimproved yconstruction should be readily apparent by reference k'to the following specification taken in connection with the accompanying drawings, and it will be underystood thatI may make any modifications in the specific details of construction shown and ydescribeclwithin the scope of the appended claim without departing from or exceeding the spirit of my invention.

Figure I represents view partially in perspective and partially in section, of my improved simplified lens grindingmachine.

Figure II represents a fragmentary view of the switch and controlmechanism.

Figure 'III represents a plan view showing the throw adjustment disc.-

In the drawings, the numeral 1 designates the base of my improved lens grinding machine` which is similarin general appearance to the ordinary electric surface grinder of the ypresent day, having the space `2 adapted to receive a-nactuating motor, which in ordinary practice is directly connected with the shaft 3 adapted to receive a lens or GRINDING MACHINE.

1919. Serial No. 309,344. n

lens holder on its tapered upper end 4. I

have here shown the member 4 as forming a portion of a. cap' or torio attachment itted on the spindle 3 and provided with the arms 5 for engagement with the arms of a regula-r torio or cylinder lens grinding block such as is well known in the art. In my improved construction, however, in place of having the motor directly secured `or connected to the shaft 8, I makeuse of my improved driving connections. The base 1 is shown as provided with the spider type frame 6, providing the journal 7 containing the bushing 8, in which the shaft 3 rotates, and Von vthe lower end of which is rotatably mounted the gear 9. This gear 9k is loosely mounted upon the bushing and has a 'different number of teeth from the adjacent gea-r 10, the gears 9 and 10 being in mesh with the pinions 11 carried by the pinion plate 12, which is loosely or rotatably mounted on the lower end of the shaft 3,.the

gear 10 being keyed on the shaft between the pinion plate and the gear 9.

Slidably keyed on the upper end-of the -motor shaft 18 is the Clutch spool 14 provided on its upper face with the clutch portion 15 adapted when in open 4position to interlock with the clutch member 85 on the vshaft 3 andbeing further provided with thedrive pin 17 adapted to engage in the pin groove 18 land abut the end ofthe groove whereby the i pin serves toimpart rotary motion to the pinionV plate 12. lTo shift the variousparts as desired,I make use of the bell crank 19 f pivoted as at 20 to the base l, and having its end' engaged by' the collars 21 on the L- shaped shift rod 22 provided with the operating handle 23. i

This shift rod may be slid in and out f rthrough the yoke 24 of the bell crank, to

slide the spool 14 yup Vand `down or toward and away from the shaft 3.

It will further be noted that the frame 1 is provided with a suitable` guide bracket having the notches 25, 26 and 27 disposed at different distances from the frame. Then the handle23 is swung to bring the rod 22 into the notch 27 the clutch will be depressed v and entirely out of engagement with the lens grinding parts, so that the motor may rotate freely. When the handle is shifted to engage the shiftrod 22 in the notch 26 the bell crank will be partially rocked to cause the pin 17 to interlock with the pinion plate 12 to drive the pinion plate. At the saine time the inner end of the rod 22 will `Contact with the abutment pin or lug 2S on the gear 9 and hold this gear against rotation. rlhe etiect then will be that the member 12 r0- tates carrying with it the pinions 11, while as the gear 9 is held against rotation the pinions will roll around on the gear and thus impart a. slow relative movement to the gear 10, and through the gear 1() to the shaft 3 slowly rotating this shaft and any parts which may be carried by it. When it is desired to operate the shaft at a higher rate of speed the lever isagain shifted into the notch 25, when the pin 1T will still be in engagement with Aand drive the pin-ion plate 12 and at the same time the clutch face 15 will interlock with the member on the drive shaft 3 to give a direct drive between the two shafts. This further shifting of the lever 22, it will be understood, is suliicient to withdraw its end from engagement with the pin 28 so that the pinions 9 will be bodily carried around by the synchi'onously rotating gear 1t) and pinion plate 12.

1t is to be noted that have shown in connection with this i'orm of mechanism as clamped to ythe edge o-iz the frame or support 1 that carries the pan 29, the sleeve 30 within which is rotatably mounted the stud shaft 31 bearing at one end et' the pullefv 32 and at 'the othertlie eccentric disc 253. rlhe pulley 3Q is connected by the belt with the belt groove 1G on the pinion plate 12 so that the shaft 31 will rotate with the pinion plate when driven. Mounted in the slot 36 oi' the eccentricl disc 33 secured on `the other end of .the shaft is a suitable T-head bolt 37 having mounted on it the clamping sleeve 38 by which the bolt may be tightened in transversely adjusted position in 'the slot te vary its eccentric relation to the stud shaft 31, while rotatably mounted on the sleeve 3S is the `block S9 to which is pivoted the lever arm a() bearing the lens holder engaging pin 41 and projecting across the pan between the guide arms 42, having on its other end the spring et?, for holding it down in operative position, a .hook on the holder L15 ot' the guide arms cooperating with the chain 46 on the end of lthe spring to facilitate adjustment ot the spring tension. Both the member ll5 and the sleeve 30 are detachably clamped to the member 1 and may be employed or not as desired, but when employed in connection with a machine o this character are extremely desirable in that they relieve the operator of the necessity ot' holding a lever by hand and working it transversely of the lap during the grinding and perform these functions automatically, the motion imparted through the use ot' the eccentric being a substantial ly circular sliding movement et' the pin l1, which in connection with the rotation ot' the shaft or spindle will produce a very satisfactory lens grinding etect.

It is to be understood, however, that my driving mechanism is equally applicable and employ-able with the belt 341 and all other parts removed and in their absence will give me a satisfactory two speed grindingmachine, giving me a slow speed for worl; requiring less speed, and more power and a` high speed as tor polishing or the like where relative lap Vmovement ot' the surface is desired, and `that I have provided a novel and improved form ot electrically or other driven surfacing machine capable ot ready variations ot' the speeds by movement et the shift lever 23 or otl stopping the machine without stopping the source ot power with- 'out disconnecting the driven spindle 3 t'roni the source yot power.

l claim:

ln mechanism ot the character described, the combination with a driven shaft and a driving shat't, ot clutch members carried by said `parts 'for direct drive engagement, and means for operating the driven shaiit at a reduced rat-e of speed, including a spider member having a pulley portion, pinions rotatably mounted on the spider member, a pair of gears having unequal numbers oit' teeth, one of said gears being lined on the driven shaft and the other being loosely mounted, and progressive operating clutch mechanism for driving the spider from the driving shatt when in one adjustment and for driving both the spider and the driven shaft when in a second adjustment, sabstan-- tially as illustrated.

ln testimony whereof I have athxed my signature, m presence ol" tivo witnesses.

ARTHUR A. ARNOLD.

llitnesses F. S. Bnooiis, E. Goonizioii. 

